No alternative that i know of...how'd you create the sca file originally without MDLC?
I've been working with MDLC for a long time, under several different operating system configurations over the years and AFAIK, MDLC will work on any computer as long as you have it set up correctly. If MDLC isn't cooperating with your computer, chances are you have user errors in your program's setup. The only times that i ever had any operational problems in the early years were due to my limited knowleadge of how to set up the program correctly at the time.
Does FSDS not convert sca files to mdl also?